A Novel Iron(III) Selective Membrane Electrode Containing a Tripodal Polycatacholamine as Sensor

作者：Bera Rati Kanta^*; Sahoo Suban K; Baral Minati; Kanungo B K

来源：Bulletin of the Korean Chemical Society, 2011, 32(10): 3592-3596.

DOI：10.5012/bkcs.2011.32.10.3592

• PVC membrane
• Tripodal
• Iron(III)
• Ion-selective electrode
• Potentiometry

A novel poly(vinylchloride)-based membrane sensor using N-1,N-3,N-5-tris(2-(2,3-dihydroxybenzylamino)ethyl)cyclohexane-1,3,5-tricarboxamide (CYCOENCAT, L) as ionophore has been prepared and explored as Fe3+ selective electrode. The membrane electrode composed of ionophore, poly(vinylchloride) and o-nitro-pheyloctyl ether in the optimum ratio 4:33:63 gave excellent potentiometric response characteristics, and displayed a linear log[Fe3+] versus EMF response over a wide concentration range of 1.0 x 10(-5) - 1.0 x 10(-1) M with super nernstian slope of 28.0 MV/decade and the detection limit of 8.0 x 10(-6) M. The proposed ion selective electrode showed fast response time (< 15 s), wide pH range (3.0-7.0), high non-aqueous tolerance (up to 20%) and adequate long life time (120 days). It also exhibited very good selectivity for Fe3+ relative to a wide variety of alkali, alkaline earth, transition and heavy metal ions. Further, the analytical applicability of the sensor was tested as an indicator electrode in the potentiometric titration of Fe3+ with EDTA.

• 出版日期2011-10-20